California earthquakes

M1.8 earthquake 3km NE of Colton, CA

A magnitude 1.8 earthquake struck 3km NE of Colton, CA on Sun, Feb 1, 1987, 6:10 AM PST (14:10 UTC), 12 km (8 mi) below the surface.

A larger quake followed: M2.0 14km SSE of Anza, CA. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.8 (mc), micro
Local time
UTC
1987-02-01 14:10:50 UTC
Depth
12.4 km (7.7 mi), shallow
Epicenter
34.090° N, 117.293° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from
From location
Station coverage gap
104°
Stations used
0

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 167 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 167.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci716554. Read Tue, Sep 22, 2026, 10:33 PM UTC.